Allow Symfony 6.0

Author: Nyholm

composer.json

@@ -18,11 +18,11 @@
     "require": {
         "php": ">=7.1.3",
         "lcobucci/jwt": "^3.4|^4.0",
-        "symfony/config": "^4.4|^5.0",
-        "symfony/dependency-injection": "^4.4|^5.0",
-        "symfony/http-kernel": "^4.4|^5.0",
+        "symfony/config": "^4.4|^5.0|^6.0",
+        "symfony/dependency-injection": "^4.4|^5.0|^6.0",
+        "symfony/http-kernel": "^4.4|^5.0|^6.0",
         "symfony/mercure": "^0.5.3",
-        "symfony/web-link": "^4.4|^5.0"
+        "symfony/web-link": "^4.4|^5.0|^6.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Bundle\\MercureBundle\\": "src/" }